feat!: align the default prettier style with create-vue instead of …

…vue core

After all, `vuejs/core` is more of a TypeScript project than a Vue project.
I feel that we really need `printWidth: 100` for templates.

And `arrowParens` isn't that important. Let's use the default value.
Moreover, as stated in [prettier's documentation](https://prettier.io/docs/en/options#arrow-function-parentheses),
`arrowParens: "always"` is better for adding type annotations, extra
arguments or default values as well as making other changes.
I believe that `arrowParens: "avoid"` is set in `vuejs/core` only
because it started using prettier in its 1.x era and want to avoid
too drastic style changes. vuejs/core#3926 (comment)

templates/_prettierrc.json.ejs

@@ -26,13 +26,13 @@
 }
 <%_ } else { _%>
 <%#
-  The default style follows the one used in the vuejs/core repository
-  <https://github.com/vuejs/core/blob/main/.prettierrc>
+  The default style follows the one used in the vuejs/create-vue repository
+  <https://github.com/vuejs/create-vue/blob/main/.prettierrc>
 %>
 {
   "$schema": "https://json.schemastore.org/prettierrc",
   "semi": false,
   "singleQuote": true,
-  "arrowParens": "avoid"
+  "printWidth": 100
 }
 <%_ } _%>